Hard Drivin' Steering Design Questions

[SofaKingRotten]

Hard Drivin' uses a 10-turn pot inline with the steering shaft and uses some kind of 'stop' that claims to be a '3 rotation stop' in the manual (see picture below). If anyone has experience with repairing or maintaining that machine I would like to talk. I would like to figure out a way to mimic that design.

My main question is: Does that steering wheel turn 1 1/2 turns each way or 3 turns each way? My current vehicle I drive only turns 1 1/2 turns each way so there doesn't seem to be a need for more than that. EDIT: I found my answer, the number is 3 complete turns, lock to lock.

It looks like the FFB motor has a long screw on the end that runs through the 'stop' mechanism all the way to the 10-turn pot. Is that screw plastic or steel?

What size round is that shaft? EDIT: I see the parts list says 3/4-16

It would be really cool if you could describe how the stop mechanism works. It just looks like a screw that ends up 'binding' or 'stops turning' when it hits the end of the threads, grabbing an 'arm' which then rotates slightly and presses into several of four rubber stops. Is that basically it?